Number of (4+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

A250733

Number of (4+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Terms

    a(0) =58a(1) =144a(2) =365a(3) =885a(4) =2092a(5) =4889a(6) =11377a(7) =26419a(8) =61330a(9) =142336a(10) =330417a(11) =767047a(12) =1781019a(13) =4135537a(14) =9603827a(15) =22303104a(16) =51797791a(17) =120298572a(18) =279397140a(19) =648909915a(20) =1507137312a(21) =3500429630a(22) =8130041844a(23) =18882699707a(24) =43856786967a(25) =101861340070

External references